The study of nutrition may focus on how to prepare healthy foods, which diets can cause diseases or how to store different kinds of foods. The study of how foods affect people can be beneficial for nutritionists, health bloggers or personal trainers.

Available at universities around the world, a PhD degree is an excellent choice for students who wish to pursue a career in academia or research. This type of degree is the highest qualification available in many fields and requires a great deal of study to obtain.